Retrieves complete details for a specific segment including all targeting conditions, logical operator (AND/OR), metadata, and usage information. Returns the full segment configuration with attribute names, operators (eq, neq, in, nin, gt, lt, exists, not_exists), comparison values for each condition, and the logical_op field that determines how conditions are combined. Use this endpoint to inspect segment logic before referencing it in flag targeting rules, or to understand which users will be included in the segment based on the defined conditions and logical operator.